<html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <div class="main> <p class="item" id="14">24</p> <p class="item" id="12">22</p> <p class="item" id="13">2</p> <p class="item" id="14">2</p> </div> </body> <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script> <script type="text/javascript"> var arr = document.getElementsByClassName('item') console.log(arr.length ) $('.item').each(function(index) { alert(index + ': ' + $(this).text()); }); </script></html>打印结果为啥是3，第一个为22，去掉main标签后就正确了，求原因
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